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固有振荡频率     
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  inherent oscillation frequency
     The theory of forced power oscillation in power system proves that the forced power oscillation may be caused by a sustained cyclic small disturbance in power system, and the resonance could be induced if the frequency of the sustained cyclic small disturbance is close to an inherent oscillation frequency, so that it leads to forced power oscillation with high amplitude.
     电力系统强迫功率振荡理论指出,持续的周期性小扰动会引起电力系统强迫振荡,当扰动频率接近系统固有振荡频率时,会引起系统谐振,导致大幅度的功率振荡。
短句来源
  natural oscillation frequency
     In the same time,the dynamical performances of the moving platform will vary if changing the performance parameters of the linear motor and the natural oscillation frequency of the platform.
     改变直线电机的性能参数及移动平台的固有振荡频率等,均可以改变平台位移输出的动态性能。
短句来源
  an inherent oscillation frequency
     The theory of forced power oscillation in power system proves that the forced power oscillation may be caused by a sustained cyclic small disturbance in power system, and the resonance could be induced if the frequency of the sustained cyclic small disturbance is close to an inherent oscillation frequency, so that it leads to forced power oscillation with high amplitude.
     电力系统强迫功率振荡理论指出,持续的周期性小扰动会引起电力系统强迫振荡,当扰动频率接近系统固有振荡频率时,会引起系统谐振,导致大幅度的功率振荡。
短句来源
  inherent fluctuation frequency
     Each given state of MHD has an inherent fluctuation frequency (eigenfrequency of MHD).
     每种特定状态下的磁流体都具有一个固有振荡频率(MHD特征频率)。
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      inherent oscillation frequency
    Method of determining the inherent oscillation frequency of steel-casting plugs
          
      natural oscillation frequency
    The constant τo is essentially the reciprocal of the natural oscillation frequency of atoms in the solid, Uo is the binding energy on the atomic scale, and γ is proportional to the disorientation of the molecular structure.
          
    The natural oscillation frequency of freely suspended liquid droplets can be related to the surface tension of the material, and the decay of oscillations to the liquid viscosity.
          
    Formulas are obtained for calculating the natural oscillation frequency of the resonant pores and conditions for their irreversible growth.
          
    A change in mean wire temperature results in a change of wire strain, which is registered by measurement of the wire's natural oscillation frequency.
          
    Vortex shedding sensors are sensitive to vibration-induced errors near their natural oscillation frequency.
          


    Based on the study of its mathmataical mode,the present paper

    本文在研究交叉耦合锁相环路的数学模型的基础上,分析环路的固有振荡频率、稳态相差、同步带及捕获带等基本性能。并导出一阶环的同步带及捕获带的近似公式。

    The resonantor is the key part of the single crystal silicon micromechanical gyro, and the mechanical performance and sensitivity of the single crystal silicon micromechanical gyro are decided by the design of structure parameters of the resonantor. In this paper, the relation between the structure parameters and its mechanical performance is studied. The rules of designing the structure parameters of the resonantor of the single crystal silicon micromechanical gyro are obtained by theoretical derivation...

    The resonantor is the key part of the single crystal silicon micromechanical gyro, and the mechanical performance and sensitivity of the single crystal silicon micromechanical gyro are decided by the design of structure parameters of the resonantor. In this paper, the relation between the structure parameters and its mechanical performance is studied. The rules of designing the structure parameters of the resonantor of the single crystal silicon micromechanical gyro are obtained by theoretical derivation and a lot of the dynamic simulations, and some useful results which describe the influence of the structure parameters on the performance of the resonantor are also studied.

    微机械单晶硅陀螺仪谐振器的结构参数设计对陀螺仪的机械性能影响很大,它决定了陀螺仪的水平和垂直方向的固有振荡频率,并影响微机械单晶硅陀螺仪谐振器的振荡幅度,因而,也直接影响微机械单晶硅陀螺仪的灵敏度。研究了微机械单晶硅陀螺仪谐振器的结构参数设计与其机械性能的关系,探讨了微机械单晶硅陀螺仪谐振器结构设计的一般原则,微机械单晶硅陀螺仪谐振器的结构参数对其动态性能有显著的影响,文中对此进行了仿真研究。

    There exists excellent corresponding relationship between weld pool oscillation frequency and weld pool size in TIG welding, which can be used to detect weld pool size and control the weld pool penetration. However, It is very difficult during fast travelling welding. In this paper, the weld pool is excited by pulsating welding current which is produced by superimposing a certain frequency sine wave current on the straight polarity DC current, and the oscillating signals of weld pool can be detected through...

    There exists excellent corresponding relationship between weld pool oscillation frequency and weld pool size in TIG welding, which can be used to detect weld pool size and control the weld pool penetration. However, It is very difficult during fast travelling welding. In this paper, the weld pool is excited by pulsating welding current which is produced by superimposing a certain frequency sine wave current on the straight polarity DC current, and the oscillating signals of weld pool can be detected through arc voltage signals in travelling TIG welding. During the time when pulsating welding current works, along with the increase of weld pool size, weld pool resonance phenomenon happens when the nature oscillation frequency of the weld pool is equal to the frequency of sine wave current. The feature variant signal of weld pool resonance, detected from arc voltage signal, is better in strength, stability and repeatability than existing method with short pulse high welding current to detect the weld pool oscillation. Moreover, this method has been used for full penetration control in TIG welding and has acquired well effect.

    熔池振荡频率与熔池尺寸之间存在良好对应关系,可以用于进行熔池尺寸检测及熔透控制,但在快速行走焊接时难度很大。本文在恒定直流之上叠加定频率正弦波电流做为脉冲焊接电流激振熔池,在连续行走焊接时,通过电弧电压检测熔池振荡即熔池尺寸。在脉冲电流作用期间,随着熔池尺寸的增长,当熔池自身固有振荡频率与焊接电流正弦波频率一致时,熔池产生谐振,从电弧电压中检测到谐振特征变化信号,该信号的强度、稳定性、重复性及与熔池尺寸的对应精度良好,优于目前已有的短时高值脉冲激振检测方法,用于进行焊接熔透控制取得了良好效果。

     
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